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Forward from Plant Tissue Culture

There are seven or eight  people that I know of on hosta open that are
also members of a plant tissue culture listserve. For Jim, Bob, Stacy,
Rick, Preston, Charles, Gretchen and John, this is a repeat.

Below is an interesting posting concerning the tissue culturing of
plants. I found it interesting because I buy a lot of tissue cultured
hosta liners. I am not suggesting that this is a problem with tissue
cultured hostas. It was my understanding once that nothing came through
the tissue culture process. Now it seems beneficial and disease causing
microorganisms both might make it through.

The Author, Ed Herman, writes often on tissue culture practices.

Dan Nelson
-----Original Message-----
From: Agricell+AEA-aol.com +ADw-Agricell+AEA-aol.com+AD4-
To: plant-tc+AEA-tc.umn.edu +ADw-plant-tc+AEA-tc.umn.edu+AD4-
Date: Monday, April 19, 1999 6:42 PM
Subject: Re: Autoclave indicators

+AD4-Although it is correct that many microorganisms are unable to grow in
+AD4-tissue culture media, a considerable body of work in recent years, e.g.
+AD4-R.D. Long et al. at University College Cork and by C. Leifert at the
+AD4-University of Aberdeen have shown that latent microorganisms in plant
+AD4-cultures can cause disease in micropropagated plantlets, even after
+AD4-periods of subculture during which neither symptoms nor evidence of
+AD4-contamination is observed.
+AD4-I must respectfully disagree with David Constantine's definition of
+AD4-contamination. By definition, contamination consists of the presence of
+AD4-a single microbial cell or spore.  Although a contaminant may not
+AD4-be harmful - indeed it may even be beneficial - it can be ignored only
+AD4-your own risk (and that of your customers).
+AD4-Ed Herman
+AD4-Agritech Publications/Agricell Report
+AD4-P.O. Box 255
+AD4-Shrub Oak, NY 10588, U.S.A.
+AD4-Phone/Fax: (914) 528 3469

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